{
  "abstract": "The recent development of wavelength-scale nonlinear waveguides highlights the need for new diagnostic methods that characterize both waveguide dispersion and fabrication-induced spatial inhomogeneities. While tightly confining waveguides enable compact and highly efficient nonlinear devices, nanometer-scale waveguide nonuniformities can limit the effective interaction length and conversion efficiency. In this work, we establish a high-throughput diagnostic method for second-order nonlinear waveguides based on near-degenerate three-wave mixing, hereafter referred to as sum-frequency tomography (SFT). In contrast with conventional diagnostics based on second-harmonic generation, SFT produces two-dimensional transfer functions that allow dispersion orders to be characterized separately from longitudinal phase-mismatch variations. We validate this technique using commercially available PPLN waveguides and show that SFT recovers the group-velocity mismatch between the interacting waves, the group-velocity dispersion of the fundamental, and a low-order polynomial approximation of the longitudinal phase-mismatch profile. SFT avoids the experimental complexities of phase-sensitive or spatially resolved measurements, enabling the characterization of individual waveguides in seconds.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": "2610.00747",
  "author_total": 7,
  "authors": [
    {
      "name": "Yi-Yang Liu"
    },
    {
      "name": "Kevin Chen"
    },
    {
      "name": "Kyungduk Kim"
    },
    {
      "name": "Ryotatsu Yanagimoto"
    },
    {
      "name": "Edwin Ng"
    },
    {
      "name": "Timothy P. McKenna"
    },
    {
      "name": "Marc Jankowski"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/dbyve2k247afy.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2610.00747",
  "fulltext_url": null,
  "id": "dbyve2k247afy",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2610.00747",
  "language": null,
  "licence": "LicenseRef-arXiv-nonexclusive-1.0",
  "licence_label": "arXiv licence",
  "licence_source": "article",
  "licence_url": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
  "metadata_licence": "CC0-1.0",
  "native_subjects": [
    [
      "arxiv",
      "physics.optics"
    ],
    [
      "openalex",
      "3107|Photorefractive and Nonlinear Optics"
    ]
  ],
  "openalex": "W7215964564",
  "pdf_url": "https://arxiv.org/pdf/2610.00747",
  "pmcid": null,
  "pmid": null,
  "published": "2026-10-01",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/dbyve2k247afy.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:26:03Z",
      "native_id": "2610.00747",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2610.00747"
    }
  ],
  "subjects": [
    {
      "field": "physics",
      "origin": "arxiv:physics.optics",
      "subfield": "optics-photonics"
    }
  ],
  "title": "Three-Wave Mixing as a High-Throughput Diagnostic Tool for Nonlinear Waveguides",
  "title_text": "Three-Wave Mixing as a High-Throughput Diagnostic Tool for Nonlinear Waveguides",
  "type": "preprint",
  "updated_at": "2026-10-30T12:26:03Z",
  "url": "https://research.draconitic.com/paper/dbyve2k247afy",
  "venue": "arXiv",
  "versions": []
}